Process for preparing sulfonyl acids
CA 2026593 A1 · Owner: Akzo Nobel Nv · Inventors: Chou, Yueting
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed a process for preparing sulfonyl acids from mercaptans in a single reactor. The mercaptan is converted to mercaptide and reacted with a lactone or lactam in an organic solvent which is removed after formation of a thioether containing acid. Water is provided as a solvent for the oxidation of the thioether to the sulfone. Mild conditions and readily available starting materials render the method capable of preparing such acids in large scale amounts.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed October 1, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 1, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 1, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.